linux-kernel - Re: [patch] kcore: fix test for end of list

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20100322233113.f17d0e0c.akpm@linux-foundation.org>
Date:	Mon, 22 Mar 2010 23:31:13 -0400
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dan Carpenter <error27@...il.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	Jiri Slaby <jirislaby@...il.com>,
	Jaswinder Singh Rajput <jaswinderrajput@...il.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] kcore: fix test for end of list

On Mon, 22 Mar 2010 15:05:09 +0300 Dan Carpenter <error27@...il.com> wrote:

> "m" is never NULL here.  We need a different test for the end of list
> condition.
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> ---
> Found with a static checker and compile tested only.  Please review
> carefully.
> 
> diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
> index a44a789..b442dac 100644
> --- a/fs/proc/kcore.c
> +++ b/fs/proc/kcore.c
> @@ -490,7 +490,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
>  		}
>  		read_unlock(&kclist_lock);
>  
> -		if (m == NULL) {
> +		if (&m->list == &kclist_head) {
>  			if (clear_user(buffer, tsz))
>  				return -EFAULT;
>  		} else if (is_vmalloc_or_module_addr((void *)start)) {

hm, that code's been there for five years.  I wonder if it's actually necessary.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/